Thick wall stainless steel pipe after surface treatment, such as sandblasting (pill), chemical cleaning, high pressure water cleaning scales, mechanical cleaning, etc., and coat lining coating or thin film materials, forming a good combination of pipe coating.

Established in 1942, the United States Houston since the first coating plant, the development pipeline to 60 s continuous internal coating technology, coating factory and field overall continuous construction technique, in the past ten years due to the repairing technology and the corresponding performance evaluation have made a major breakthrough technology, has achieved good using effect, make the internal coating protection technology in the development of a new step.

The coating materials and coating technology used for corrosion prevention of stainless steel thick wall pipe coatings shall meet the following conditions:

(1) excellent adhesion to the steel pipe interface, especially the wet film adhesion ability of the coating.

(2) in order to reduce the protection cost, the surface treatment requirements of steel pipes should be as low as possible without affecting the corrosion quality.

(3) surface coatings have excellent corrosion resistance, wear resistance, temperature resistance and media penetration resistance.

(4) the coating process selected can ensure good active adhesion between various surfaces of the protective layer structure, give full play to the properties of coating materials and avoid interface pollution.

(5) the comprehensive economic benefits of the protective layer are the best.

Stainless steel thick wall pipe pipeline inside antiseptic coating materials

Thick wall stainless steel pipe anticorrosion layer (also referred to as coating) material variety, similar to the quality of the products difference is bigger also, often when the user chooses various test parameters according to the lab comparison and on-site performance compared to determine the bolt.As for the protective performance index of coating in oil and gas pipelines, there is no unified standard at home and abroad at present.Routine test in the laboratory indexes after acceptance, acceptance of coating products can adopt the following three indicators: (1) - using endoscopic appearance or closed-circuit television (CCTV) - there is no flow, knit ground, orange peel, blister, fisheye defects;Circulatory thickness -- using magnetic thickness meter -- generally not less than 250 m.The thickness of the corrosion resistant layer should not be less than 400F/m from the consideration of wet anti-corrosion.Detection of coating leakage - using spark breakdown or resistance detection.

Most commonly used coatings are epoxy, epoxy phenolic, polyurethane and lacquer phenol.Primer coatings are generally mixed with ferrous red, chrome yellow and other passivating fillers, and intermediate and surface coatings are mixed with scales or glass beads to improve their anti-permeability.The performance of the coating is improved by selecting suitable fillers and additives for different purposes.All the above mentioned work falls within the scope of formulation design and coating structure design of antiseptic coatings. Please refer to the related monograph for details.Cement mortar lining and polyolefin film lining are commonly used in water pipeline.

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